Manhole covers through continuous development for decades, overall performance is close to steel, is based on this excellent performance, it has been successfully used to cast some of the complexity of the bearing capacity of cast iron covers prices, the strength and toughness of cast iron covers offer , abrasion resistance requirements are more parts. Taigu Chang foundry specializing in the production of ductile iron manhole covers and cast iron rainwater grate, welcome to order! Taigu Chang share basic knowledge of foundry ductile iron manhole cover with you: manhole covers are generally divided into round and square, in the city's highways in general, circular, because a circular diameter cast iron covers covers easy to tilt, It can better protect the safety of pedestrians and vehicles. If using a square, because it is significantly longer than the diagonal of the square on each side, cast iron covers, it is easy to fall into the well in a diagonal direction when the wellhead such covers are rolled, killing a security risk. If the wellhead made of round or significantly smaller than covers, square covers will not fall into the well. Cast iron covers cast iron manhole covers _ _ Xinzhou in foundry Chang Chang on by Taigu foundry. Taigu Chang in foundry (www.sxcnzz.com) strong, credible, in Jinzhong machining industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement of innovative ideas will lead foundry Chang into the brilliant and you work for a better future!